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2023 NECO CHEMISTRY PRACTICAL ANSWERS POSTED

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(3ai)

phenolphthalein

(3aii)

I. Pink

ll. Colourless

(3aiii)

(i)To give a sharp change in colour at the end of the acid base reaction

(3aiv)

(i)the burette must be rinsed with the acid or allow it to drain after rinsing with distilled water

(ii)Air bubble must not be allowed in the burette

(3av)

Neutralization reaction

(3bi)

I. Hofmann voltameter.

II. Kipp‘s apparatus

(3bii)

Because silver nitrate is photosensitive (i.e.sensitive to light) Therefore,if the silver nitrate is left in sunlight or any bright light, it breaks down (hydrolyses) to give black/brown silver oxide and nitric acid.

 

 

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